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+<?xml version='1.0'?>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+ xmlns:doc="http://nwalsh.com/xsl/documentation/1.0"
+ xmlns:dyn="http://exslt.org/dynamic"
+ xmlns:saxon="http://icl.com/saxon"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ exclude-result-prefixes="doc dyn saxon"
+ version='1.0'>
+
+<!-- ********************************************************************
+ $Id: utility.xsl 7101 2007-07-20 15:32:12Z xmldoc $
+ ********************************************************************
+
+ This file is part of the XSL DocBook Stylesheet distribution.
+ See ../README or http://docbook.sf.net/release/xsl/current/ for
+ copyright and other information.
+
+ ******************************************************************** -->
+<doc:reference xmlns="" xml:id="utility">
+ <info>
+ <title>Common » Utility Template Reference</title>
+ <releaseinfo role="meta">
+ $Id: utility.xsl 7101 2007-07-20 15:32:12Z xmldoc $
+ </releaseinfo>
+ </info>
+ <!-- * yes, partintro is a valid child of a reference... -->
+ <partintro xml:id="partintro">
+ <title>Introduction</title>
+ <para>This is technical reference documentation for the
+ miscellaneous utility templates in the DocBook XSL
+ Stylesheets.</para>
+ <note>
+ <para>These templates are defined in a separate file from the set
+ of “common” templates because some of the common templates
+ reference DocBook XSL stylesheet parameters, requiring the
+ entire set of parameters to be imported/included in any
+ stylesheet that imports/includes the common templates.</para>
+ <para>The utility templates don’t import or include any DocBook
+ XSL stylesheet parameters, so the utility templates can be used
+ without importing the whole set of parameters.</para>
+ </note>
+ <para>This is not intended to be user documentation. It is
+ provided for developers writing customization layers for the
+ stylesheets.</para>
+ </partintro>
+</doc:reference>
+
+<!-- ====================================================================== -->
+
+<doc:template name="log.message" xmlns="">
+ <refpurpose>Logs/emits formatted notes and warnings</refpurpose>
+
+ <refdescription id="log.message-desc">
+ <para>The <function>log.message</function> template is a utility
+ template for logging/emitting formatted messages&#xa0;– that is,
+ notes and warnings, along with a given log “level” and an
+ identifier for the “source” that the message relates to.</para>
+ </refdescription>
+
+ <refparameter id="log.message-params">
+ <variablelist>
+ <varlistentry><term>level</term>
+ <listitem>
+ <para>Text to log/emit in the message-level field to
+ indicate the message level
+ (<literal>Note</literal> or
+ <literal>Warning</literal>)</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>source</term>
+ <listitem>
+ <para>Text to log/emit in the source field to identify the
+ “source” to which the notification/warning relates.
+ This can be any arbitrary string, but because the
+ message lacks line and column numbers to identify the
+ exact part of the source document to which it
+ relates, the intention is that the value you pass
+ into the <literal>source</literal> parameter should
+ give the user some way to identify the portion of
+ their source document on which to take potentially
+ take action in response to the log message (for
+ example, to edit, change, or add content).</para>
+ <para>So the <literal>source</literal> value should be,
+ for example, an ID, book/chapter/article title, title
+ of some formal object, or even a string giving an
+ XPath expression.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>context-desc</term>
+ <listitem>
+ <para>Text to log/emit in the context-description field to
+ describe the context for the message.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>context-desc-field-length</term>
+ <listitem>
+ <para>Specifies length of the context-description field
+ (in characters); default is 12</para>
+ <para>If the text specified by the
+ <literal>context-desc</literal> parameter is longer
+ than the number of characters specified in
+ <literal>context-desc-field-length</literal>, it is
+ truncated to <literal>context-desc-field-length</literal>
+ (12 characters by default).</para>
+ <para>If the specified text is shorter than
+ <literal>context-desc-field-length</literal>,
+ it is right-padded out to
+ <literal>context-desc-field-length</literal> (12 by
+ default).</para>
+ <para>If no value has been specified for the
+ <literal>context-desc</literal> parameter, the field is
+ left empty and the text of the log message begins with
+ the value of the <literal>message</literal>
+ parameter.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>message</term>
+ <listitem>
+ <para>Text to log/emit in the actual message field</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>message-field-length</term>
+ <listitem>
+ <para>Specifies length of the message
+ field (in characters); default is 45</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refparameter>
+ <refreturn id="log.message-returns">
+ <para>Outputs a message (generally, to standard error).</para></refreturn>
+</doc:template>
+<xsl:template name="log.message">
+ <xsl:param name="level"/>
+ <xsl:param name="source"/>
+ <xsl:param name="context-desc"/>
+ <xsl:param name="context-desc-field-length">12</xsl:param>
+ <xsl:param name="context-desc-padded">
+ <xsl:if test="not($context-desc = '')">
+ <xsl:call-template name="pad-string">
+ <xsl:with-param name="leftRight">right</xsl:with-param>
+ <xsl:with-param name="padVar"
+ select="substring($context-desc, 1, $context-desc-field-length)"/>
+ <xsl:with-param name="length" select="$context-desc-field-length"/>
+ </xsl:call-template>
+ </xsl:if>
+ </xsl:param>
+ <xsl:param name="message"/>
+ <xsl:param name="message-field-length" select="45"/>
+ <xsl:param name="message-padded">
+ <xsl:variable name="spaces-for-blank-level">
+ <!-- * if the level field is blank, we'll need to pad out -->
+ <!-- * the message field with spaces to compensate -->
+ <xsl:choose>
+ <xsl:when test="$level = ''">
+ <xsl:value-of select="4 + 2"/>
+ <!-- * 4 = hard-coded length of comment text ("Note" or "Warn") -->
+ <!-- * + 2 = length of colon-plus-space separator ": " -->
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:value-of select="0"/>
+ </xsl:otherwise>
+ </xsl:choose>
+ </xsl:variable>
+ <xsl:variable name="spaces-for-blank-context-desc">
+ <!-- * if the context-description field is blank, we'll need -->
+ <!-- * to pad out the message field with spaces to compensate -->
+ <xsl:choose>
+ <xsl:when test="$context-desc = ''">
+ <xsl:value-of select="$context-desc-field-length + 2"/>
+ <!-- * + 2 = length of colon-plus-space separator ": " -->
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:value-of select="0"/>
+ </xsl:otherwise>
+ </xsl:choose>
+ </xsl:variable>
+ <xsl:variable name="extra-spaces"
+ select="$spaces-for-blank-level + $spaces-for-blank-context-desc"/>
+ <xsl:call-template name="pad-string">
+ <xsl:with-param name="leftRight">right</xsl:with-param>
+ <xsl:with-param name="padVar"
+ select="substring($message, 1, ($message-field-length + $extra-spaces))"/>
+ <xsl:with-param name="length"
+ select="$message-field-length + $extra-spaces"/>
+ </xsl:call-template>
+ </xsl:param>
+ <!-- * emit the actual log message -->
+ <xsl:message>
+ <xsl:if test="not($level = '')">
+ <xsl:value-of select="$level"/>
+ <xsl:text>: </xsl:text>
+ </xsl:if>
+ <xsl:if test="not($context-desc = '')">
+ <xsl:value-of select="$context-desc-padded"/>
+ <xsl:text>: </xsl:text>
+ </xsl:if>
+ <xsl:value-of select="$message-padded"/>
+ <xsl:text> </xsl:text>
+ <xsl:value-of select="$source"/>
+ </xsl:message>
+</xsl:template>
+
+<!-- ===================================== -->
+<doc:template name="get.doc.title" xmlns="">
+ <refpurpose>Gets a title from the current document</refpurpose>
+ <refdescription id="get.doc.title-desc">
+ <para>The <function>get.doc.title</function> template is a
+ utility template for returning the first title found in the
+ current document.</para>
+ </refdescription>
+ <refreturn id="get.doc.title-returns">
+ <para>Returns a string containing some identifying title for the
+ current document .</para></refreturn>
+</doc:template>
+<xsl:template name="get.doc.title">
+ <xsl:choose>
+ <xsl:when test="//*[local-name() = 'title'
+ or local-name() = 'refname']">
+ <xsl:value-of select="//*[local-name() = 'title'
+ or local-name() = 'refname'][1]"/>
+ </xsl:when>
+ <xsl:when test="substring(local-name(*[1]),
+ string-length(local-name(*[1])-3) = 'info')
+ and *[1]/*[local-name() = 'title']">
+ <xsl:value-of select="*[1]/*[local-name() = 'title'][1]"/>
+ </xsl:when>
+ </xsl:choose>
+</xsl:template>
+
+<!-- ===================================== -->
+<doc:template name="pad-string" xmlns="">
+ <refpurpose>Right-pads or left-pads a string out to a certain length</refpurpose>
+ <refdescription id="pad-string-desc">
+ <para>This function takes string <parameter>padVar</parameter> and
+ pads it out in the direction <parameter>rightLeft</parameter> to
+ the string-length <parameter>length</parameter>, using string
+ <parameter>padChar</parameter> (a space character by default) as
+ the padding string (note that <parameter>padChar</parameter> can
+ be a string; it is not limited to just being a single
+ character).</para>
+ <note>
+ <para>This function began as a copy of Nate Austin's
+ <function>prepend-pad</function> function in the <link
+ xlink:href="http://www.dpawson.co.uk/xsl/sect2/padding.html" >Padding
+ Content</link> section of Dave Pawson's <link
+ xlink:href="http://www.dpawson.co.uk/xsl/index.html" >XSLT
+ FAQ</link>.</para>
+ </note>
+ </refdescription>
+ <refreturn id="pad-string-returns">
+ <para>Returns a (padded) string.</para></refreturn>
+</doc:template>
+<xsl:template name="pad-string">
+ <!-- * recursive template to right/left pad the value with -->
+ <!-- * whatever padChar is passed in -->
+ <xsl:param name="padChar" select="' '"/>
+ <xsl:param name="leftRight">left</xsl:param>
+ <xsl:param name="padVar"/>
+ <xsl:param name="length"/>
+ <xsl:choose>
+ <xsl:when test="string-length($padVar) &lt; $length">
+ <xsl:call-template name="pad-string">
+ <xsl:with-param name="padChar" select="$padChar"/>
+ <xsl:with-param name="leftRight" select="$leftRight"/>
+ <xsl:with-param name="padVar">
+ <xsl:choose>
+ <!-- * determine whether string should be -->
+ <!-- * right- or left-padded -->
+ <xsl:when test="$leftRight = 'left'">
+ <!-- * pad it to left -->
+ <xsl:value-of select="concat($padChar,$padVar)"/>
+ </xsl:when>
+ <xsl:otherwise>
+ <!-- * otherwise, right-pad the string -->
+ <xsl:value-of select="concat($padVar,$padChar)"/>
+ </xsl:otherwise>
+ </xsl:choose>
+ </xsl:with-param>
+ <xsl:with-param name="length" select="$length"/>
+ </xsl:call-template>
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:value-of
+ select="substring($padVar,string-length($padVar) - $length + 1)"/>
+ </xsl:otherwise>
+ </xsl:choose>
+</xsl:template>
+
+</xsl:stylesheet>